A P-type binary star system has two stars that orbit close to each other, and the system orbits around that. An S-type system, on the other hand, is two stars that orbit at some distance from each other, and thus may each have their own system. I’m going to place such a system in my world, each with it’s own set of planets.

Unlike in the P-type system, where you calculate the stars as though they were one entity, in the S-type you treat them separately. Thus, my results:

Primary Star

Secondary Star

Property

Calculation

Calculation

Mass

1.21

0.75

Luminosity

1.95

0.37

Diameter

0.90

0.56

Surface Temperature

1.10

0.86

Lifetime

0.62

2.05

Distance to Barycenter

153.06

246.94

Eccentricity

0.40

0.50

Maximum Separation from Barycenter

560.00

600.00

Minimum Separation from Barycenter

240.00

200.00

System

Maximum Separation

1,160.00

Minimum Separation

440.00

Inner Limit

0.12

0.08

Outer Limit

48.40

30.00

Frost Line

6.77

2.93

Habitable Zone

1.40

0.60

Minimum Habitable Zone

1.33

0.57

Maximum Habitable Zone

1.91

0.83

Forbidden Zone Edge

146.67

The forbidden zone edge is important. The outer limits of each system need to fall well inside the forbidden zone to prevent the stars from interfering in each other’s system. Looks like we are good there, with stars still close enough to be significant in each other’s sky.

We can then lay out the first system like so:

Primary System

Orbit

In Kilometers

Orbit 1

0.17

24928024.98

Orbit 2

0.29

44122604.21

Orbit 3

0.58

86921530.29

Orbit 4

0.86

128643864.8

Habitable Planet

1.59

237991149.9

Orbit 6

2.37

354606813.4

Orbit 7

4.53

677299013.6

Biggest Gas Giant

7.38

1103997392

Orbit 9

12.32

1843675645

Orbit 10

17.87

2673329685

Orbit 11

29.49

4410993980

Orbit 12

47.18

7057590369

And the second system as:

Secondary System

Orbit

In Kilometers

Orbit 1

0.10

14766732.9

Orbit 2

0.14

21559430.04

Orbit 3

0.20

30614390.66

Orbit 4

0.39

59085773.97

Habitable Planet

0.72

108126966.4

Orbit 6

1.08

161109179.9

Orbit 7

1.76

262607963.2

Biggest Gas Giant

2.93

438555298.6

Orbit 9

5.39

806941749.3

Orbit 10

8.20

1226551459

Orbit 11

16.15

2416306374

Orbit 12

25.36

3793601008

This system is actually going to form the core of the worlds controlled by the dominant system race. While humans will exist in this setting, they will not be the dominant race and will, in fact, not be native to this section of the galaxy. The dominant race originated on the habitable planet in the primary system, and later spread through that system and into the secondary system, where they encountered the much less developed race on the habitable planet there and promptly enslaved them.